20.500.12556/DKUM-37794 SINTEZA NANODELCEV CrNi Z MIKROEMULZIJSKO METODO SYNTHESIS OF CrNi NANOPARTICLES WITH MICROEMULSION METHOD Namen diplomskega dela je bil sinteza nanodelcev CrNi z mikroemulzijsko metodo. V območju stabilnosti mikroemulzij v ternarnem diagramu (voda/CTAB, n-butanol/izooktan) smo izbrali dve točki z različnimi masnimi deleži (20/40/40 in 20/50/30) in v teh dveh točkah sintetizirali CrNi magnetne nanodelce z različnimi sestavami: Cr1-xNix (x=0.7, 0.8, 0.9), pri čemer smo kot reducent uporabili NaBH4. Delce smo najprej termično obdelali s pomočjo termoanaliznega sistema TGA-SDTA v N2 atmosferi pri 500 ° C z namenom njihove homogenizacije. Zaradi možne aplikacije v medicinske namene (magnetna hipertermija) smo želeli pridobiti delce z ustrezno Curiejevo temperaturo. Delce smo v ta namen še dodatno homogenizirali v cevni peči pri temperaturi 900°C, 12 ur, v redukcijski atmosferi (Ar/H2). S tem smo hkrati želeli preprečiti oksidacijo delcev. Vzorce smo kvalitativno analizirali z rentgensko praškovno difrakcijo (XRD). S pomočjo termogravimetrične analize (TGA) smo vzorce segreli na 500 °C in jim s prirejeno TGA aparaturo določili Curiejevo temperaturo (Tc). Diploma work focuses on synthesis of nanoparticles CrNi with microemulsion method. We prepared two different compositions of microemulsions in the region of microemulsion stability with mass % (20/40/40 and 20/50/30) in ternary water/CTAB, n-butanol/isooctane diagram. In those two compositions we synthesized CrNi magnetic nanoparticles of different alloy compositions: Cr1-xNix whereas (x = 07, 08 and 09). The reducing agent was NaBH4. The particles were first thermal treated with the TGA-SDTA thermoanalytical system in N2 at 500°C because of homogenization. Because of the application for medical purposes (magnetic hyperthermia) we tried to get the particles with appropriate Curie temperature. So, we additionally homogenised particles in a tube furnace at 900°C for 12 hours under reducing atmosphere (Ar/H2). With that, we tried to prevent the particles from oxidation. A qualitative analysis of the samples was carried out using the X-ray diffraction (XRD) and the Curie temperature measured with thermogravimetric analysis (TGA) which was also used to heat the samples to 500°C. mikroemulzija magnetni nanodelci Curiejeva temperatura termična obdelava rentgenska praškovna difrakcija microemulsion magnetic nanoparticles Curie temperature thermal treatment powder x-ray diffraction true true false [S. Markuš] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2012-09-10 21:42:38 2012-09-11 11:55:43 2022-04-24 22:07:45 2021-04-17 03:26:48 2012 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 54.057:[620.3:546.72](043.2) 16607254 URN:SI:UM:DK:OFBDY3YE UNI_Markus_Sabina_2012.pdf UNI_Markus_Sabina_2012.pdf 1 55FF439D876B8CFECFB3FD8666497810 95a1a1d7715714fd86c663a8d7933067b96c60da764c2702416a576df7876782 55d06824-7c08-11eb-bb7a-00155d0001ca 20.500.12556/dkum/cc7b4be0-d8f6-4a66-aeef-7ea41428dca3 https://dk.um.si/Dokument.php?lang=slv&id=50021 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0